摘要
1985年8月—1986年10月(2,9月除外),在长江口海区进行了鱼卵、仔鱼调查。结果表明,该海区系由淡水鱼类、半咸水鱼类和沿岸、近海鱼类四种生态类型组成的鱼类生态结构,具有特殊复杂的生态特点;其种类组成和数量分布,皆受长江径流、台湾暖流及黄海冷水团等水系的相互消长、交换而形成的错综复杂的海况条件所制约。目前该海区的鱼类种间数量对比关系发生变化。历史上的重要经济鱼类数量极少,而作为它们的主要饵料之一的鳀鱼数量却占绝对优势。这与渔业上的过度捕捞和滥捕有很大关系。因此,以发展增、养殖事业来转化和降低捕捞强度,对保护鱼类资源具有重大意义。
The eggs, larvae and juveniles of fishes at the mouth of Changjiang River was investigated from Aug. 1985 to Oct. 1986 (except Feb. and Sept. 1986). The result shows that the fish structure of the area investigated consists of four different ecological groups: the fresh-water, brackish, neritic and coastal water species. Their specific composition and quantity have been restricted by the intricate sea conditions including the Changjiang River runoff, Taiwan Warm Current and Yellow Sea (Huanghai) Cold Water Mass.Most of fresh water fishes breed in the river course during summer flood. Hov/ever, the fishes of brackish water spawn in the low reaches of the Changjiang River and near by the river mouth in spring when the temperature of surface water is 12.0-20.0℃, the salinity is 0.1-12.0 S. When the temperature is 18.0-30.0℃ from late spring to early autumn, the neritic and coastal fishes spawn in shallower turbid water where salinity is 5.0-26.0S, and limpider water where the salinity is 24.0-33.0 S.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1990年第4期346-355,共10页
Oceanologia Et Limnologia Sinica
